Skip to main content

Hiroki Asari: Sparse Representations for the Cocktail Party Problem

Movies Preview

movies
Hiroki Asari: Sparse Representations for the Cocktail Party Problem


Published 2007


This is a talk given at the Redwood Center for Theoretical Neuroscience, UC Berkeley on March 1, 2007. Speaker is Hiroki Asari, Watson School of Biological Sciences, Cold Spring Harbor Laboratory.

Abstract:
A striking feature of many sensory processing problems is that there appear to be many more neurons engaged in the internal representations of the signal than in its transduction. For example, humans have about 30,000 cochlear neurons, but at least a thousand times as many neurons in the auditory cortex. Such apparently redundant internal representations have sometimes been proposed as necessary to overcome neuronal noise. We instead posit that they directly subserve computations of interest. Here we provide an example of how sparse overcomplete linear representations can directly solve difficult acoustic signal processing problems, using as an example monaural source separation using solely the cues provided by the differential filtering imposed on a source by its path from its origin to the cochlea (the head-related transfer function, or HRTF). In contrast to much previous work, the HRTF is used here to separate auditory streams rather than to localize them in space. The experimentally testable predictions that arise from this model--- including a novel method for estimating a neuron's optimal stimulus using data from a multi-neuron recording experiment---are generic, and apply to a wide range of sensory computations.


Run time 70:48
Producer Redwood Center for Theoretical Neuroscience
Audio/Visual sound, color

comment
Reviews

There are no reviews yet. Be the first one to write a review.
SIMILAR ITEMS (based on metadata)
Community Video
by Redwood Center for Theoretical Neuroscience
movies
eye 447
favorite 0
comment 0
Community Video
by Redwood Center for Theoretical Neuroscience
movies
eye 851
favorite 0
comment 0
Community Video
movies
eye 5,069
favorite 0
comment 0
Community Video
by Redwood Center for Theoretical Neuroscience
movies
eye 836
favorite 1
comment 0
Community Video
movies
eye 1,148
favorite 0
comment 0
Community Video
movies
eye 745
favorite 0
comment 0
Community Video
by Redwood Center for Theoretical Neuroscience
movies
eye 970
favorite 2
comment 1
favoritefavoritefavorite ( 1 reviews )
Community Video
by Redwood Center for Theoretical Neuroscience
movies
eye 816
favorite 1
comment 0
Community Video
movies
eye 7,275
favorite 2
comment 1
favoritefavoritefavoritefavorite ( 1 reviews )
Community Video
by Redwood Center for Theoretical Neuroscience
movies
eye 725
favorite 0
comment 0